CONTROL PANEL (TYPE 5)SYSTEMS OPERATIONReturn of Commercial (Normal) PowerWhen commercial power returns, the automatic transfer switchtransfers the load to commercial power. Remote start initiating contacts(1) open. This de-energizes run relay (RR).When run relay (RR) is de-energized, contacts (RR2) close andcontacts (RR1) open. (RR2) closed completes a circuit to shut-offsolenoid (SS). The shut-off solenoid moves the rack to the fuel OFFposition. (RR1) opens to de-energize the arming relay (AR).After the engine stops, (TDX) contact will open to de-energize theshut-off solenoid.NOTE: TDX is operated by the TDR time delay relay. It has afixed delay on drop out of 70 seconds. This means, theshut-off solenoid will remain energized for 70 seconds eachtime the unit is shutdown.Diode (Dl) is in the shut-off solenoid circuit to help prevent electricalsparks (arcing), at the shut-off solenoid contacts, when the shut-offsolenoid is de-energized.248
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